Enterprise's writing was bad at times, but there's no way that's any excuse for how bad Blalock's acting was. There's a difference between Vulcan and wooden. If anyone wants to continue saying it was the writing, take a look at her appearances on Stargate as Ishta. *shudder*

Her performance there had two settings (on a range of 1-10): 1 and 15.

I'd agree that Blaylock could be very hit and miss as T'pol. One episode she'd hit it out-of-the-park and the next would be a foul tip out to the catcher.